Problem With Users on Some Mailbox Servers on BES 5 Server Only (firewalls involved)

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Hi,

I am converting my 4.1.7 BES servers (exchange 2007) to BES 5.01

About 1400 of them have transported successfully, but the users on mailbox servers in another part of our domain will not function on the BES 5 servers.

The firewall guys tell me that the segment containing my BES servers (both the 4.1.7 and 5 servers ) is open to the mailbox servers and they are not seeing any denies. The BES servers use the same besadmin account - and as I mention - the users work fine on the 4.1.7 BES servers - so I know all my exchangeadmin roles are fine (or at least, that is how I read it). I am seeing this mapi error in the magt log - looks like firewall issues to me - but ...